Battery chargers

Max out productivity while you're out and about with this handy keychain charger. The battery, which is roughly the size of a Zippo lighter and weighs just 4 oz, can restore 30% of your iPhone's power capacity. It's a perfect power solution for those who find built-in battery cases too bulky. Grab one for $35 US at photojojo.com.

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The SecondWind charger is designed to put power back into disposable AA and AAA alkaline batteries. Pop your dry Duracells and Energizers into the charger and they'll be ready to go again in 90 minutes. ( The unit will shut off power to your batteries after they've been in the unit for four hours, eliminating potential safety hazards. The SecondWind is $59.99 at secondwindcharger.com. (Supplied)

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The Battery Doctor Pro app for iOS not only maxes out your battery's charge capacity, it also provides info on how much time your phone will stay running at your current battery level, and shows you which apps are sapping your energy while running in the background. Pick it up for $1 at the App Store. (Supplied)

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Andru is a phone charger shaped like that cuddly green Android logo; its eyes light up blue when your phone's charging and white when your phone's on standby power. And just in case that wasn't enough, its arms are poseable. Make a friend for $24.99 US at thinkgeek.com. (Supplied)

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Get your java jolt with this colour-changing battery mug. The heat of your drink will change the battery to "full"; as you drink, or as the mug cools, the green bars fade. For the gamers, there's also a pixellated "life" heart that fills and empties. It's $15 US at thinkgeek.com. (Supplied)